Why function called by function name not working when function is created by assigning it to a variable? [duplicate]

// I created two function in JavaScript

// **Function 1**

function add(a, b) {
  return a + b;
}

// To call above function I use and it worked as expected
add(2, 3);




// **Function 2**

let x = function mul(a, b) {
  return a * b;
}

// To call above function I use two ways
x(2, 3);

mul(2, 3); // This won't work. Why?

Why the mul(2,3); throwing an error?

mul(2,3) is the name of the function, it should be used to call the function.

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